"Erosion of Land by Rainwater" Earth's surface and its changes PPT download

Description

"Erosion of Land by Rainwater" Earth's surface and its changes PPT download

Part One: Exploration Activities

Experiment Name How Rain Affects Land

Experimental speculation that rain will change the terrain

Experimental method: simulate rain and observe the impact of rain on the land

Experimental materials: soil, water, plastic bottles with holes, boxes

Experimental steps

1. Use soil to pile a slope in a rectangular box;

2. Prepare a plastic bottle with a hole in the cap as a water sprayer;

3. Place the box on the newspaper and raise one end of the box;

4. Squeeze the sprinkler to let the water spray out.

Rainwater and runoff will wash away the fine sand and silt, leaving many rills on the slope. These rills are cut ditches formed by rainwater flowing over the surface and eroding the land on the slope. Many cut ditches form a large horizontal line below. Gully.

Runoff refers to the water that flows along the surface or underground under the influence of gravity from rainfall and ice and snow melt, or when watering the ground.

The force of falling rain can break up and splash soil particles. When the rain reaches the ground, it carries away these particles and a part of the soil is taken away. This is erosion.

Rainwater erosion of land PPT, part 2: expansion and extension

river landforms

A general term for various erosion and accumulation forms formed by rivers acting on the earth's surface, including river erosion landforms such as ravines and erosion plains, and river accumulation landforms such as alluvial plains and deltas.

Studying river landforms, understanding the evolution process of rivers, and predicting the changing trends of rivers are of great significance to water conservancy, transportation, industrial and agricultural production, and urban construction.

Erosion is a phenomenon in nature and an important cause of the deterioration of the natural environment. External forces such as wind, flowing water, glaciers, and waves all have destructive effects on surface rocks and their weathering products.

Rainwater erosion of land PPT, part 3 content: Class summary

Rainwater and runoff will take away soil from the surface, causing the land to erode. Erosion changes the topography of the surface.

Rainwater erosion of land PPT, Part 4 content: Classroom exercises

1. Choice

1. After it rains, the power of raindrops can break up and splash the soil. Will the land change if this situation continues? ()

A. Yes B. No C. Not sure

2. The most easily washed away by rain is ( ) in the soil

A.Gravel B.Clay C.Sand

2. Fill in the blanks

1. Rainwater will take away the soil from the land and cause the land to be affected by ( ).

2. Erosion will continue to ( ) the topography.

3. Large amounts of rainwater may accumulate on the surface ( ).

4. ( ) is a weather phenomenon that occurs frequently.

Rainwater erosion of land PPT, Part 5 content: After-school homework

As a group, continue the experiment to explore the factors that affect erosion.

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For more information about the PPT courseware "Earth's Surface and Its Changes and Rainwater's Erosion of Land", please click the Earth's Surface and Its Changes ppt Rainwater's Erosion of Land ppt tag.

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"The Effect of Rivers on Land" The Earth's Surface and Its Changes PPT Download Part One: Exploration and Discovery Rivers are the collective name for larger natural water flows on the earth's surface. They are formed by runoff generated by melting ice and snow or rainfall. What rivers do to land Explore rivers..

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Update Time: 2024-06-25

This template belongs to science courseware Fifth Grade Science Volume 1, Textbook Edition industry PPT template

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